6 cornered glued box with cover lock



May 2, 1961 c. D. FALLERT 2,982,465

6 CORNERED GLUED BOX WITH COVER LOCK van.;

6 CORNERED GLUED BOX WITH COVER LOCK Cliiford D. Fallert, St. Louis, Mo., assigner to Crown Zeilerbach Corporation, San Francisco, Calif., a corporation of Nevada Filed Mar. 5, 1958, Ser. No. 719,422

Claims. (Cl. 229-36) The invention relates to a one piece collapsible carton suitable for the packaging of frozen foods and the like, comprising an essentially leak-proof bottom tray and a hinged full telescoping cover with a locking means for retaining the cover in closed condition when the contents are packed therein.

More especially the invention comprises a six cornered collapsible glued carton comprising a bottom panel with attached front and back walls, end walls attached to the bottom panel scored diagonally to permit inward collapsing and flaps attached to the front and back walls folded right angularly inwardly and glued to the end walls of the tray. The front wall is provided with a locking ap on its upper edge substantially co-extensive in length therewith folded downwardly ilatwise against the exterior face of the wall with a detent or locking projection on each end extending slightly beyond the ends of the front wall. A cover panel substantially co-extensive in dimensions with the bottom panel of the tray is hinged to the back wall of the tray with side walls attached to the' cover panel scored diagonally for collapsing inwardly and a front wall attached to the sides of the cover panel which with the side walls of the cover, telescope the tray in the closed position of the carton. Flaps on the end walls of the cover provided with folding clearance on their bottom edges are folded inwardly and glued to the inner face of the front wall of the cover. Openings aligned with the detents of the front tray wall locking ilap are provided in the fold line of the cover side walls and their inwardly folded aps which enclose the said detents and lock the cover to the tray in the closed position of the carton.

Further details and advantages of the present invention will be apparent from the following specification and drawings:

Fig. l is a plan view of the single blank for forming the carton;

Fig. 2 is a perspective view of the blank of Fig. l after assembly and partially collapsed for shipment;

Fig. 3 is a perspective view of the container fully assembled with the cover :in position for telescoping over the tray;

Fig. 4 is a perspective view of the container in closed locked position.

Fig. 5 is a sectional view of the closed container of Fig. 4, taken in the direction of the arrows 5 5.

The blank forming the carton in illustrated in Fig. 1. Longitudinal scores and transverse scores 11 define the bottom panel 12 of the tray, front panel 13, back panel 14, the cover panel 15 and front wall 28 thereof. Transverse score 17 defines the top edge of the front wall panel 13 and the hinge line of the locking ap 18 with detents 19 on each end thereof. Slightly outwardly diverging slots 23 separate glue flaps 16 and 22 from end walls 2i! of the tray provide folding clearance for said flaps. The end walls are scored diagonally at 21 from the juncture of the diverging slots 23 and the longitudinal scores 10 to the outer edges of the walls. Slits 25 nited States Patent O fice' vseparate glue aps 22 attached to the back Wall 14 of the tray from end walls 24 attached to the cove'r panel 15. The end walls 24 ofthe cover are scored at 26 diagonally outwardly from the juncture of the longitudinal score 10 and transverse scores 11. Slightly diverging slots 29 separate the glue flaps 27 attached to the end walls 24 of the cover from the front wall 28 of the cover. Openings 30 are formed in the end walls of the cover positioned to be in alignment with the detents 19 in locking ap 18 in the fully erected position of the carton.

The blank may be erected in any convenient manner, a preferred method being to fold the front and -back 'walls of the tray upwardly in right angular relation to the bottom panel 12 and attaching the glue flaps 16 and 22 of the front and back walls respectively to the end walls 20.

The front and end walls 24 attached to the cover panel 15 may then be folded in right angular relation to the cover panel and the glue aps 27 attached to the cover front wall 2d. This completes the assembly.

The carton with the cover ready to close the tray is illustrated in Fig. 3. The cover panel 15 may then be folded over the tray with the end walls 24 and front wall 28 telesco-png the end wallsY 20 and `front wall 13 of the tray. In this closed position the detents or locking projections 19 011 the front wall flap `18 automatically extend through the openings 30 in the cover member and lock the container in the closed position illustrated in Fig. 4.

The unique locking means described is particularly in firm parallel relation to the front wall of the trayl l through the double eiect of the position of the detents directly securing the walls together and the outward resiliency of the locking ap providing frictional resistance to movement. y l

A feature of the carton is the simplicity and ease with which it may be collapsed for shipment. The collapsing is effected by folding the end walls 20 of the tray inwardly about the diagonal scores 21 and the front wall 13 inwardly over the collapsed end walls and then folding the end walls 24 of the cover inwardly about the diagonal scores 26 and the front wall 28 over the collapsed end walls. The cover is then folded iiatwise over the previously collapsed tray, all as illustrated in Fig. 2 to form the completely collapsed pre-assembled carton in flat form of shipment.

The carton of the invention is particularly adapted to the use of automatic machinery -in enclosing the sealed carton with an outer protection wrapper, the simple locking device being very eective in firmly maintaining the cover in closed position and the front walls of the cover and tray in parallel relation until the over wrapping is completed.

The present invention may be embodied in other speciiic forms, the embodiment described being illustrative and not restrictive, the appended claims rather than the foregoing description indicating the scope of the invention.

I claim:

l. A one piece collapsible carton having an essentially leak-proof bottom tray and a fully telescoping cover member hinged to the back wall of the tray, adapted for packaging frozen foods and the like, means for securely locking the cover to the tray to facilitate overwrapping the package by automatic machinery, said means comprising a locking flap hinged to the top edge of the front panel of the tray, substantially co-extensive in length therewith folded downwardly against the outer face of Y the front wall, the tlap being provided with detents on each end extending slightly beyond the ends of the front Y wall and complementary openings in the end walls of the cover member immediately adjacent the juncture thereof with the front wall of the cover member, posi.

tioned whereby in the telescoped position of the cover over the tray, said detents pass into and become enclosed by said openings, securely locking the cover to the tray.

2. A one piece collapsible Corton, having an essentially leak-proof bottom tray and a fully telescoping cover including means for securely locking the cover to the tray, said tray comprising a bottom panel with front, back and end walls integral therewith folded right angularly upward, the Walls being co-extensive in height, the end Walls being scored diagonally from their intersection with the side walls and bottom panel to their free outer edges, flaps integral with the ends of the front and back walls, with slightly tapered bottom edges, secured to the inner faces of the end walls, the end wall outer facing being planar, a locking flap co-extensive in length hinged to the upper edge of the front wall folded flatwise against the outer face of the wall, the locking iiap having detents on each end extending beyond the ends of the front wall, a cover panel substantially co-extensive in dimensions with said bottom panel, hinged to the upper edge of the f back tray wall having end walls with planar inner facing and a front wall integral with the cover panel, the end walls being diagonally scored from their intersection with the front walls and cover panel, to their free outer edges, folded right angularly downward, flaps on the ends of the end panels folded inwardly and glued to the front wall of the cover, openings in the end walls adjacent the fold line of the glue aps integral therewith, the said openings being positioned to receive the detents of the front tray wall when the cover is telescoped over the tray,

thereby locking the cover to the tray in the closed position of the carton.

3. The carton set forth and claimed in claim `l, wherein the fully fabricated carton is collapsed in ilat form for storage and shipment, with the end walls of the cover collapsed inwardly about diagonal scores over the cover panel, the side walls of the tray collapsed inwardly about diagonal scores over the bottom panel, the front panel of the tray collapsed over the side walls and the collapsed tray folded i'latwise over the collapsed cover.

4. A one piece collapsible carton, having a substantially leak-proof bottom tray and telescoping cover, the tray comprising a bottom panel with front, back and end Walls integral therewith folded right angularly upward, aps integral with the ends of the front and back Walls secured to the inner faces of the end walls, the outer facing of end Walls being planar and adapted to slidable passage of the telescoping cover, said tray end walls diagonally scored from their intersection with the adjacent walls and bottom panel to their free outer edges, the telescoping cover member hinged to the back wall of the tray and comprising a top panel with front and end walls integral therewith folded right angularly downward, flaps on the ends of the end panels folded inwardly and secured to the inner facing of the front Wall of the cover, the inner facing of the end walls being planar and adapted to slidable passage with the tray end walls, said cover end walls diagonally scored from their intersection with the front wall and cover panel to their free outer edges, means for securely locking the cover in closed telescoped relation to the tray, said means comprising a locking flap hinged to the top edge of the front panel of the tray substantially co-extensive therewith and folded downwardly against the outer face of the front wall, the Ilap being provided with detents on each end extending beyond the ends of the front wall, complementary openings in the end walls of the cover members positioned so that in the closed position of the cover over the tray the detents are engaged in the complementary openings locking the cover in closed position.

5. A hinged cover container made from paper sheet board material including a main box having a bottom, side walls and front and rear end walls, projections extending outwardly from the front corners of the box and below the top thereof, said projections extend laterally from the each end of a flange which is hinged to the top edge of the front wall of the box and folded downwardly over said wall, a hinged lid for the box, the top of said lid being hinged to the rear end wall, said lid having side panels and a front panel overlapping the side walls and the front wall of the box when the lid is in closed position, said lid having openings in the side panels adjacent the front corners thereof into which the projections project to lock the lid in closed position.

Merenberg Sept. 13, 1955 Osteen Jan. l5, 1957 

